Weber, Leigh: A Study of Nucleolar Exclusion: Crosses Involving Xenopus Laevis Victorianus, X. L. Laevis, X. Borealis, and Adult Hybrid Females, 1986, Box: 4. Cornell University Office of Undergraduate Biology honors theses, 53-2-4432. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/919597 Accessed August 27, 2026.