YOUTH 10/19 F The Problem of Youth [C-14] 10/19 S Youth 10/43 S Youth YVES 15/33 F Simon, Yves 1938-1947 15/33.01L Yves Simon to Charles DeKoninck 1938/1122 15/33.02L Charles DeKoninck to Yves Simon 1938/1202 15/33.03L Yves Simon to Charles DeKoninck 1940/0206 15/33.04L Yves Simon to Charles DeKoninck 1940/0921 15/33.05L Yves Simon to Charles DeKoninck 1940/1228 15/33.06L Yves Simon to Charles DeKoninck 1941/0109 15/33.07L Charles DeKoninck to Yves Simon 1941/0111 15/33.08L Charles DeKoninck to Yves Simon 1941/0114 15/33.09L Yves Simon to Charles DeKoninck 1943/0531 15/33.10L Yves Simon to Charles DeKoninck 1944/02 15/33.11L Yves Simon to Charles DeKoninck 1944/1119 15/33.12L Yves Simon to Charles DeKoninck 1944/1207 15/33.13L Charles DeKoninck to Yves Simon 1944/1212 15/33.14L Yves Simon to Charles DeKoninck 1944/1230 15/33.15L Yves Simon to Charles DeKoninck 1945/0112 15/33.16L Yves Simon to Charles DeKoninck 1945/0826 15/33.17L Yves Simon to Charles DeKoninck 1945/1004 15/33.18L Charles DeKoninck to Yves Simon 1946/0215 15/33.19L Yves Simon to Charles DeKoninck 1946/0223 15/33.20L Yves Simon to Charles DeKoninck 1946/0620 15/33.21L Yves Simon to Charles DeKoninck 1946/1228 15/33.22L Yves Simon to Charles DeKoninck 1947/0116 15/33.23L Charles DeKoninck to Yves Simon 1947/0206 15/33.24L Yves Simon to Charles DeKoninck 1947/0209 15/33.25L Yves Simon to Charles DeKoninck 1947/0311 15/33.26L Yves Simon to Charles DeKoninck 1947/0130 15/33.27L Yves Simon to Charles DeKoninck 1947/0406