CLASSIFIED LIST OF RECENT REPORTS 
OF GEOLOGICAL SURVEY. 
Since 1910, reports issued by the Geological Survey 
have been called memoirs and have been numbered Memoir 
1, Memoir 2, ete. Owing to delays incidental to the pub- 
lishing of reports and their accompanying maps, not all of 
the reports have been called memoirs, and the memoirs 
have not been issued in the order of their assigned numbers, 
and, therefore, the following list has been prepared to pre- 
vent any misconceptions arising on this account. 
