http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Abstracts issued in separate numbers, 1909-June 1932.
One of the Cushing Library/Dykes copies - v.1 (1889-1890) - is from the Edsko J. and Margarett A. Dyksterhuis Collection and is inscribed by the Secretary of Agriculture.
Issued July 1915-June 1923 by States Relations Service.
Beginning with v. 50 an index is issued covering the preceding ten vols.