M.D. Leggett
Subject Matter Index of Patents for Inventions Issued by the United States Patent Office from 1790 to 1873, Inclusive (3 Vol. Set)- Subject-Matter Index of Patents for Inventions Issued by the United States Patent Office from 1790 to 1873 (Amer in 2 Centuries Series)
- Subject-Matter Index of Patents for Inventions Issued by the Us Patent Office from 1790 to 1873 (Amer in Centuries Series)
- Subject-Matter Index to Patents for Inventions Issued by the Us Patent Office from 1790 to 1873 (Amer in Two Centuries Series)