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A Text-Book 
General Lichenology 
WitH DESCRIPTIONS AND FIGURES OF THE GENERA 
OccuURRING IN THE 
NORTHEASTERN UNITED STATES. 
BY 
ALBERT SCHNEIDER, M.S., M. D. 
The only modern work on North American Lichens, including a dis- 
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_ Large octavo, 230 pages, 76 full-page plates. Price in paper, $3.80; 
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—————— 
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