- William Blackwood and Sons2
- Wilson, Herbert M. (Herbert Michael), 1860-19202
- Wisconsin. Geology and Natural History Survey2
- Wm. M. Bradley & Bros.2
- Wright, George Burdick, 1832-18822
- Yeager, Joseph, approximately 1792-18592
- Young, Gilbert2
- Zatta, Antonio, active 1757-17972
- de Lavanha, I. B.2
- de Mannevillette, Jean-Baptiste-Nicolas-Denis d' Apreès, 1707-17802
- A. Hoen & Co.1
- A.S. Barnes & Co.1
- Abbot, E. T. (Civil engineer)1
- Abbott, E. T. (Edward T.), 1847-19381
- Abert, J. W. (James William), 1820-18971
- Académie royale des sciences (France)1
- Ackermann and Co.1
- Adams, Henry, Captain1
- Adept Map Co.1
- Akerson, E. A1