The rapid expansion of research activity in all disciplines of science and technology and the concomitant growth in the number of scientific publications have caused a con­ siderable strain on library budgets. Even well-endowed libraries find it too expensive to collect all scientific journals. Research workers therefore often find it difficult to discover the extent and nature of work done on a particular molecule. Moreover, liter­ ature searches, even in a well-equipped li­ brary, take a great deal of time and effort. In recent years the need for a comprehensive bibliography of the spectroscopy of poly­ atomic organic molecules, particularly the derivatives of benzene, naphthalene, and diazine, has been keenly felt. This volume has therefore been prepared to provide easy access to information on infrared, Raman, absorption, emission, fluorescence, and phosphorescence spectroscopy, and also re­ lated calculations. It covers about 900 or­ ganic ring compounds. These compounds are arranged in alphabetic order; references are given in chronological sequence for each molecule, each characterized as to the tech­ nique and conditions covered. Thus, much library time may be saved and, in particular, even researchers who do not have convenient access to a really good library will be able to locate pertinent references in a matter of seconds. 7 Vibrational Analysis - C.R. Acad. Sci.