Product Details: • Quantity: Lot of 7 distinct lesson cards • Publisher: Standard Publishing Co. (Stamped "Series 810, S. P. Co.") • Era: Linen Era (1930-1945) • Type: Printed Lithograph / Chromolithograph • Material: Textured Linen Cardstock • Size: Standard postcard size (approx. 5.5" x 3.5") • Country of Origin: Printed in the U.S.A.