lis publication is issued four times a year. 



All exchanges should be addressed to the " Library of the University 

 of Colorado, Boulder, Colo." 



Educational institutions, libraries, societies and individuals desiring 

 to be placed on the exchange list should make request to the " Secretary 

 of the University of Colorado, Boulder, Colo.," to whom also should 

 be addressed any correspondence in regard to purchase of single copies. 



