Bulletin no. 40 is a reprint from the Report on field operations of the Division of soils (U. S. Dept. of agriculture) for 1900, being no. 1, cooperative, by the U. S. Dept. of agriculture and the Arizona agricultural experiment station. Bulletin no. 63 is a reprint of Bulletin no. 235, Office of experiment stations (U. S. Dept. of agriculture) being no. 2, cooperative, by the U. S. Dept. of agriculture and the Arizona agricultural experiment station.
Special Numbering
Bulletin [no.12] June 30, 1894, being issued by a new administration, was unnumbered in the regular series and was called "Series II, no. 1". 6th-8th annual reports are published as Bulletin no. 19, 24 and 25 respectively.