Wynkyn de Worde inherited Caxton's stock of woodcuts, and early in his career used some of them again in reprints of the Golden Legend and Speculum Vitae Christi, and in his larger Horae used the full set of cuts which, while in Caxton's hands, is only known from those which appear in the Fifteen Oes.
"Fine Books"
Alfred W. Pollard
On a waste sheet of a copy of the Fifteen Oes, he noticed what appeared to be a set off of another book, and on closer inspection this turned out to be a page of a Book of Hours, of which no copy has ever been found.
"A Short History of English Printing, 1476-1898"
Henry R. Plomer
But, by creeping very close, With the good wall's help,-their eyes might strain And stretch themselves to Oes, Yet never catch her and me together, As she left the attic, there, By the rim of the bottle labelled "Ether," And stole from stair to stair, And stood by the rose-wreathed gate.
"Browning and the Dramatic Monologue"
S. S. Curry