Christie, Agatha, 1890-1976. Hercule Poirot mysteries.

1st Harper paperback

Nemean lion -- Lernean hydra -- Arcadian deer -- Erymanthian boar -- Augean stables -- Augean stables -- Stymphalean birds -- Cretan bull -- Horses of Diomedes -- Girdle of Hyppolita -- Flock of Geryon -- Apples of the Hesperides -- Capture of Cerberus