Lesieg Theo 1904 1991 is not used in this library's catalog.

For works of this author written in collaboration with Michael K. Frith, search also under Stone, Rosetta, 1904-1991  For works of this author entered under other names, search also under Geisel, Theodor Seuss, 1904- ,  LeSieg, Theo., 1904-  

Try a search for Seuss, Dr.