The Standard Catalog identifies them as the "1948 Cleveland Indians Picture Pack".....33 photos.
I have collected the various team issues (Boston Red Sox, Brooklyn Dodgers, Cleveland Indians, New York Giants,
and New York Yankees) from 1947 to 1951.
They are tough to find, especially in nice condition, but are great collectibles representing a great era in BB. And,
many of these photos were the source pictures for the early Bowman cards.
TED Z