The topographical map document geological fieldwork completed by August Foerste in Vermont (undated). Notations are numbered locations. There is a note on the front of the map stating, "numbers refer to notebook of J. E. Wolff, also papers of J. E. Wolff and notes of A. F. Foerste."
Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu.