Try the Green Library at Stanford, they have the original BLW paint color diagrams from that era:
Stanford University
Special Collections and University Archives
Green Library- Bing Wing 200
557 Escondido Mall
Stanford, CA 94305-6004
650-725-1161
[library.stanford.edu]
PHYSICAL DESCRIPTION:
5.5 linear feet
SUMMARY:
This collection represents a small portion of the records of the Philadelphia steam locomotive production firm known as the Baldwin Locomotive Works until its merger with Lima-Hamilton Corporation. The materials include ledgers, specification books, and drawings for construction and decoration of locomotives, as well as publications of the company. One book deals with the railroads of South America. The collection also includes 436 copy slides (done in 1985) of paint books numbers 1 and 2.