- -Oui, ma bonne mère- Sophie Tremadeure Ulliac, Phénomènes et Métamorphoses, Paris, Bibliothèque de la Jeune Fille, Didier, 1854.
- –Uncle Philip’s, Conversations- Uncle Philip’s, Conversations with Young Persons, New York, J. & J. Harper, 1833, p. 73-76.
- -Make a drawing- Ernest E. Unwin, Pond problems, Cambridge, The Cambridge nature study series. Cambridge University Press, (1914), 1934, p. 49-50.
- –Armorplate- Jim Ure, Bait for trout, being the confessions of an unorthodox angler, Chicago, Henry Regnery company, 1973, p. 73.