NEW YORK SEMI-WEEKLY TRIBUNE, March 22, 1878   Page 4 has a nice article: "Explaining The Phonograph" "Ladies' Day at the Telephone Office". The report includes in part: "...The exhibition of Professor Edison's phonograph has lately attracted so many spectators...Mr. Applebaugh seated himself by the phonograph & for three hours devoted himself to experiments & explanations...". Then much detail on how his invention operates. 
Sixteen pages, some damp staining to the top quadrant, 12 by 17 inches, good condition.