Yiu-yitsu yudo / Ernst Altstadt

Yibrán Khalil Yibrán : su vida y su obra / Elias Konsol

Yerutí (tórtola) / [por] Azucena Carranza [y] Leonor M. Lorda Perellón. Ilustró Francisco de Santo

Yerbas que deprimen el desarrollo ganadero en Oriante / Raúl E. Alonso Olivé

Yearbook of international organizations : 11th (1966-1967) edition / The encyclopaedic dictionary of international organizations, their officers, their abbreviations

Yearbook of international organizations

Yearbook of international organizations, 1997-1998 / ed. by Union of International Associations

Yearbook of international organizations, 1990/91 / Edited by Union of International Associations

Yearbook of International Organizations, 1995-1996

Yearbook of international organizations, 1986/87. Volume 1. Organization descriptions and index / edited by Union of International Associations