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...