Basic Earth Science Systems, Inc. was founded in 1969 and is based in Denver, Colorado.Basic Earth Science Systems, Inc. engages in the exploration, acquisition, development, operation, production, and sale of crude oil and natural gas in the United States. Basic Earth Science Systems, Inc. focuses its activities in the North Dakota and Montana portions of the Williston basin, the Denver-Julesburg basin of Colorado, the southern portions of Texas, and the onshore portions of the Gulf Coast. As of March 31, 2009, Basic Earth Science Systems, Inc. owned working interest in 94 producing oil wells and 36 producing gas wells in the states of North Dakota, Montana, Colorado, Texas, and Wyoming. Basic Earth Science Systems, Inc. estimated proved developed and undeveloped oil and gas reserves were 794,000 barrels of oil equivalent.

Sprague Energy Corp., founded in 1870 as a coal and oil supplier, has grown into one of the largest fuel suppliers on the US's Eastern Seaboard. A portfolio company of investment firm Axel Johnson, Sprague Energy's products include diesel, gasoline, home heating oil, and residual fuels. The company distributes about 170 billion cu. ft. of natural gas, 2.5 billion gallons of petroleum products, and 3 million tons of bulk materials each year and owns or operates some 20 oil terminals.

Stone Energy Corporation was founded in 1993 and is headquartered in Lafayette, Louisiana with additional offices in Houston, Texas, and Morgantown, West Virginia. Stone Energy Corporation engages in the acquisition, exploration, development, operation, and production of oil and gas properties located in the Gulf of Mexico and Appalachia region. As of December 31, 2008, Stone Energy Corporation had estimated proved oil and natural gas reserves of approximately 518.9 Bcfe.With rising oil prices Stone Energy Corporation has been able to acquire more properties. Stone Energy Corporation has sold the bulk of its Rocky Mountain oil and gas properties in order to focus its energy on targeting reserves and production in the deep shelf and deep water areas of the Gulf of Mexico. In 2008 the company acquired fellow Gulf explorer Bois d'Arc Energy for about $1.7 billion.

Always at the top of its game, Apex Oil sells, stores, and distributes petroleum products. Its range of refined products includes asphalt, biodiesel, kerosene, fuel oil, diesel fuel, heavy oil, gasoline, and bunker fuels. The company's terminals are primarily located on the East Coast and Gulf Coast, in California, and in the Midwest. Internationally, Apex Oil has operations in the Bahamas, Monaco, and the Netherlands. The company's subsidiaries include Apex Towing, a tug boat and barge business; Petroleum Fuel and Terminal, a storage and truck rack operation; and Enjet (oil and carbon black marketing). Apex Oil is controlled by CEO Tony Novelly.

Webber Oil Company provides home heating oil and propane in Maine and New Hampshire. Webber Oil has 18 heating oil and propane supply locations in Maine, and three in New Hampshire. Webber Oil Company, which was founded in 1935 by Alburney Webber, also rents and installs energy efficient space heaters and hot water heaters, and provides other energy-related services. Webber Oil Company once owned and operated more than a dozen gas stations and convenience stores in the region, but in late 2008 decided to exit that business. Webber Energy Fuels remains one of the largest and most progressive fuel companies in New England.

Richland Partners (doing business as Leffler Energy) puts its energy into supplying home heating oil products to areas of Pennsylvania, Maryland, New Jersey, and Delaware. Richland Partners, LLC also installs and services heat pumps, central air conditioning, and hot water heaters. Meenan Oil, a subsidiary of Star Gas, purchased both SICO and Leffler and merged them to form Leffler Energy in 2003. With its roots in serving farming communities, Leffler Energy still provides a broad range of fueling and energy services (from customer service centers and storage facilities) to rural businesses throughout central and eastern Pennsylvania.

Secunda Marine Services (Secunda) owns and operates a technologically advanced fleet of offshore support vessels servicing oil and gas companies nationally and internationally. Secunda, founded in Nova Scotia, has grown its fleet to 14 vessels and one training vessel on a solid foundation of highly experienced sailors, maritime work ethic, and philosophy of providing a superior service to our customers. Secunda Marine Services Provides supplies and services for oil and gas facilities off the east coast of Canada, the North Sea, and Gulf of Mexico, Secunda International boasts such long-term customers as Exxon Mobil, Petro-Canada, Apache, and Technip. From 1998 to 2006, Secunda Marine spent about $160 million to build two vessels and convert seven. J. Ray McDermott, a unit of McDermott International acquired the company in 2007 for about $260 million.

Global Geophysical builds its business from the ground down. Global Geophysical Services, Inc. provides seismic data acquisition services to the oil and gas industry for locating potential reservoirs and studying known reserves. Global Geophysical transmits sound waves below the earth's surface to create two- and three-dimensional images of the existing subsurface geology. The firm's seismic crews work in a wide variety of terrains, including deserts, jungles, mountains, and swamps, and have completed projects in more than 100 countries, including Algeria, Argentina, Chile, Colombia, Georgia, India, Iraq, Mexico, Oman, Peru, and Uganda. In 2009 the company filed for an IPO.

Apco Oil & Gas International Inc.was founded in 1970 and is headquartered in Tulsa, Oklahoma.Apco Oil & Gas International Inc. engages in the exploration and production of oil and gas properties. Apco Oil & Gas International Inc. owns interests in seven oil and gas concessions and one exploration permit in Argentina. The company primarily holds a 52.79% interest in the exploration, production, and development of oil and gas in the Entre Lomas concession located in the provinces of Rio Negro and Neuquen in southwest Argentina. Apco Oil & Gas International Inc. was formerly known as Apco Argentina Inc. and changed its name to Apco Oil & Gas International Inc. on July 16, 2009. Apco Oil & Gas International Inc. is a subsidiary of Williams Companies, Inc.

Superior Plus has four divisions that try to live up to its bold corporate name. Superior Propane distributes propane and provides related services and products to clients across Canada through some 170 locations. Winroc, which has 44 branches in Canada and the US, offers construction products to the walls and ceilings industry. Superior Energy Management provides natural gas supply services to Canadian residential, commercial, and industrial customers. Another unit, ERCO Worldwide, offers potassium and chloralkali (chlorine and an alkaline salt) products in North America, as well as sodium chlorate and technology to the paper and pulp sectors.

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