From Introduction and Summary: "This bulletin presents the results obtained n-heptane by the petroleum thermodynamics laboratory of the Bartlesville, Okla., facility. Detailed results of five investigations are given; selected values if the low-temperature thermal properties are tabulated; and comparisons with results that were obtained in other laboratories are made. The findings of this extensive study will serve to characterize the low-temperature thermal data for over 100 compounds that will be presented in a later bulletin of this series."

Photograph of the watershed, Double Creek, Site No. 4. Land use changed from native pasture to [unclear] in the flood pool area. Native grasses were killed in 1957 due to high water after which was sodded with cotton [?] Bermuda grass. Seen in the photo is Mr. Walter Sears standing in the native grass with the tame grass in the background. OK-1601-5.

Photograph of a watershed area. The Double Creek Site # 4. Land use changed from a native pasture to tame the flood pool area. Native grasses were killed in 1957 due to high water after which it was sodded with common bermuda. OK-1601-4

Photograph of a watershed area. The Double Creek Site # 4. Land use changed from a native pasture to tame the flood pool area. Native grasses were killed in 1957 due to high water after which it was sodded with common bermuda. OK-1601-3.

Photograph of Double Creek Site 14. Land use changed from native pasture to tame-in the flood pool area. Native grasses were killed out in 1957 due to high water after shich was seeded with common bermudagrass.