"United States." . . . . . . "Revenue Act of 1921 with 1922 amendments includes income taxes on individuals and corporations, administrative provisions, and general provisions : with explanatory digest of these and the estate tax, stamp taxes, capital stock tax and all other federal taxes"@en . . . . "Federal tax law with explanatory digest"@en . . . . "Revenue Act of 1921 with 1922 amendments : includes income taxes on individuals and corporations; administrative provisions and general provisions; with explanatory digest of these and the estate tax; stamp taxes; capital stock tax and all other federal taxes"@en . . . . . .