USA stamp souvenir pads

Lot 9010 limit € 30

30 pieces in total, including: "Winter Headquarters of Philately St. Petersburg Philately Exhibition 22.-26, 1938" (green, olive green, red and blue edition), "Chicago Philatelic Society 1935 Open House 1935", "Fourth annual Hotel Sherman Chicago Hobby Show November 4 to 9 1935" etc., unchecked on stock cards