LANTERN SLIDES pS^klTtk 

 and PROJECTION TEACHEnf^ 



For Nature-Study and Science Teachers LECTURERS. 



■ m addition to 



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projection, contains descriptive matter and lists of Fifteen 



Set s of Educational Slides — more than 800 slides and 



over 4000 illustrations. 



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 Eighteenth volume begins February 1912. 

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