- Hall Brothers (Atlanta, Ga.)1
- Hamery, George T.1
- Hammersmith Engraving Company (Milwaukee, Wisc.)1
- Hammond Incorporated1
- Hanany, Shaul1
- Hansen, Gretchen JA1
- Hanson, R. C.1
- Hardcastle, E. L. F. (Edmund Lafayette), 1824-18991
- Harmon, E. L. (Surveyor)1
- Harmon, George W., 1861-19431
- Harper & Brothers1
- Harper, Roland M. (Roland McMillan), 1878-19661
- Harris County (Tex.). Engineering Department1
- Harris, Harding1
- Harris, K.L1
- Harris, Sylvanus C1
- Harrison & Smith Company (Minneapolis)1
- Harrison & Warner.1
- Harrison, John J1
- Harrison, John, active 1784-17931