Report of comparative tests of roundels from an ophthalmologist's standpoint

Report of comparative tests of roundels from an ophthalmologist's standpoint

Collection:
Medicine in the Americas, 1610-1920
Alternate Title(s):
Proceedings of the Railway Signal Association
Author(s):
Black, Nelson Miles, author
Publication:
[Bethlehem, Pa.?] : [publisher not identified], [between 1904 and 1909?]
Language(s):
English
Format:
Text
Subject(s):
Lighting
Color
Railroads
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)
Extent:
20 pages
Illustrations:
Illustrations
NLM Unique ID:
101164836 (See catalog record)
OCLC no.:
51553492
Permanent Link:
http://resource.nlm.nih.gov/101164836