A systematic search for the references appearing in this bibliography was made in the following for the period 1950 to 1962: Nuclear Science Abstracts; Chemical Abstracts; Science Abstracts, Section A; Engineering Index; Applied Mechanics Review. In addition, Chemical and Engineering Progress and Dissertation abstracts were consulted for theses, and the references in many bibliographies already prepared on this subject were checked. Many references appearing prior to this period have been included because of their importance to the subject.