INTRODUCTION XVII 



many fields. These will be acknowledged separately in a list of such directories that 

 we plan to publish elsewhere. We have depended very heavily upon such lists at one 

 stag-e, and we express our thanks to those whose hard work produced them. 



The exacting- work of typing the final copy for photographing, and inserting the 

 numerous changes up to the last minute, was ably accomplished through the skill 

 of Mrs. Gloria Stokes of Carbondale. Her continuing efforts have literally made the 

 publication possible. 



