Title: Dictyocaulidae, Heligmosomatidae, and Ollulanidae of animals
Subjects: Nematodes, Medical helminthology, V. 4., Gelʹmintologicheskai͡a laboratorii͡a (Akademii͡a nauk SSSR), Nematoda, Gelʹmintologicheskai︠a︡ laboratorii︠a︡ (Akademii︠a︡ nauk SSSR)