POP-UP. (BLUE RIBBON) MOTHER GOOSE. NY: Blue Ribbon (1933). Thick 4to (7 x 8 3/4"), pictorial boards, hinges strengthened with some stress on binding, but it is tight and VG IN DUST WRAPPER (dw frayed at spine ends). Hundreds of nursery rhymes are illustrated by HAROLD LENTZ with color endpapers, many black and whites and 4 fabulous double page color pop-ups. Because of the thickness of the pages few copies of the thick Blue Ribbon pop-ups have survived in fine condition and this seems to be the rarest title in this series.