Combined issues, 1918/1919-1930/1931, designated as 1st two year cumulation-7th two year cumulation, as well as 7th annual vol.-19th annual vol.
Alternate annual issues, 1919-1931, cover two years, and are designated 1918/1919-1930/1931.
Issues for 1913-1917 also called v. 1, no. 5-v. 5, no. 5 of the quarterly ed.; issues for 1918-1922 also called v. 6, no. 10-v. 10, no. 10 of the monthly (with each designated as the Dec. issue)
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