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- [43] THE FEDERAL INCOME TAX UNIVERSITY OF PENNSYLVANIA LAW REVIEW AND AMERICAN LAW REGISTER, 1927, 75 (08): : 793 - 794
- [46] INCOME TAX - FEDERAL INCOME TAX RETURNS BY DENTISTS JOURNAL OF THE CANADIAN DENTAL ASSOCIATION, 1974, 40 (01): : 45 - 48
- [48] Oil and Gas Federal Income Tax Manual, 7th edition TAXES-THE TAX MAGAZINE, 1953, 31 (03): : 239 - 239
- [49] Oil and Gas Federal Income Tax Manual, 6th edition TAXES-THE TAX MAGAZINE, 1950, 28 (02): : 176 - 176