Mar. 1937-May 1939 issued by Bureau of agricultural engineering, United States Department of agriculture in cooperation with state departments, other federal bureaus and local organizations, March 1940-May 1953, issued by United States Department of agriculture, Soil conservation service, Division of irrigation in cooperation with Colorado Agricultural experiment station, other federal bureaus and state and local organizations
Issuing office varies, Feb. 1955- U.S. Soil Conservation Service
May 1946-May 1951, some issues are Colorado. Agricultural Experiment Station, Fort Collins. Miscellaneous paper series i.e. Miscellaneous series paper. Feb. 1952- some issues are Colorado Agricultural Experiment Station, Fort Collins. General series paper (100 C71G), but recorded in this call no
Beginning Feb. 1956 absorbs its Snow surveys and irrigation water forecasts for the Rio Grande drainage basin (1.96 R31Fsr) and its Federal-State cooperative snow surveys and irrigation water forecasts for Colorado River drainage basin (1.96 R31Fsc)
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