Law 22 of February 3, on Stamp Tax ; Law 29 of February 11, amending and supplementing the Fiscal Code ; Law 31 of February 17, authorizing a loan for public works ; Law 39 of March 6, and Law 47 of March 17, amending Law 29 and clarifying Law 22 of 1925 - Jones, Kenneth H. (Translator) (National Printing Office, 1925)