John G. Nicolay, The Outbreak of Rebellion

[xviii] such as from the meagreness or conflicting nature of the evidence any one might fall into. He would gladly have appended to his pages full references and citations, but want of space absolutely forbade.

So many kind friends have encouraged and aided him, that he finds it impossible to acknowledge their services in detail, and therefore takes this occasion to return to one and all his sincere thanks. Government officials, especially, of all grades, have with uniform courtesy afforded him every facility in their power. Without free access to the various departments and archives-and, above all, to the vast historical treasures of the Library of Congress — it would have been exceedingly difficult to gather and verify the numerous facts, quotations, names, and dates, which his narrative required.