XXll BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Special Editions % 



14- 40, 



plate 



1, 



40 



copies. 



March 



31, 1917 



40- 67, 



a 



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240 



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31, 1917 



67- 70, 



" 



3, 



100 



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31, 1917 



70- 80, 



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140 



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81-123, 



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240 



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177-188, 







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189-234, 







215 



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31, 1917. 



CORRECTIONS AND INSERTIONS 



Contributors to volume 28 have been invited to send corrections and in 

 sertions to be made in their papers, and the volume has been scanned with 

 some care by the Editor. The following are such corrections and insertions as 

 are deemed worthy of attention : 



Page 207, line 12 from top ; for "Perdue" read Purdue 

 " 256, line 24 from top ; for "figure 8" read figure 6 

 " 332, line 6 from bottom ; for ''Lake Ontario" read Lake Erie 

 " 728, line 13 from top ; for "inorganic" read organic 



t Bearing imprint [From Bull. Geol. Soc. Am., Vol. 28, 1916]. 



