Biblio
] . Anon.1966. A Comparative Anatomical Study on the Effects of Mutant Genes on the Pericarp and Seed Coat of Safflower (Carthamus tinctorius L.). University of Arizona.
. Anon.1965. The Differentiation of Tracheary Elements from the Cambium of Pinus Edulis Engelm: The Correlation of Differentiation with Measured Ring Width and Environmental Factors. Botany. Botany. University of Arizona.