The Instruments of the Orchestra - Booklet signed by +25 famous conductors

Illustrated booklet about the instruments of the orchestra, from 1930's or 1940's, with signatures of the most prominent conductors of the XX century including: Fritz Reiner, Otto Klemperer, Sir Thomas Beecham, Igor Stravinsky, Ernest Ansermet, Arturo Toscanini (signature cut glued to one of the pages), Leopold Stokowski (glued signature cut), Sir John Barbirolli, Sir Georg Solti, Arthur Rodzinsky (handwritten personal card), Eugene Ormandy, Arthur Friedler, Seiji Ozawa, Carlo Maria Giulini, Bruno Walter, Serge Kouzevitsky, Georg Szell, Erich Leinsdorf, Dmitri Mitropoulos, Antal Dorati, Adrian Boult, Charles Munch, André Cluytens, Fritz Busch, Pierre Monteaux plus a couple of unidentified signatures. 

Size is 9.5 x 12.25 inches, hard covers, 52 pages including blank pages for concert notes which were used for the signatures, most pages are loose, in fair condition.