Annals of Library Science and Documentation 1988,35(3),134-147 IDENTIFICATION OF CORE JOURNALS IN SCIENCE AND TECHNOLOGY: A STUDY BASED ON INSDOC'S DOCUMENT DELIVERY DEMAND. PART II - CHEMISTRY AND CHEMICAL TECHNOLOGYVUTSRQPONMLKJIHGFEDCBA High demand core journals in chemistry and chemical technology were identified through the analysis of document copy requests received by Insdoc during 1980-1985. It was found that only 131 identified journals out of 759 che- mistry journals could satisfy a majority of docu- ment demand in chemistry and chemical tech- nolgy. The list of 131 COre journals is also compared favourably with the rank list of the British Library Document Supply Centre (BLDSC) and also with that of the Science Citation Index (fCR 1984). In this part, attempts have been made to draw a core list of journals in the field of chemistry and chemical technology by analysing the requests received for document supply at INSDOC through the years 1980-1985. The present study aims at : compiling a list of top 50 core journals in chemistry and chemical technology; identifying the journals (from the list drawn) available in National Science Library (NSL) and the other parts of the country; the countries of origin of these journals; identifying the holdings of such journals in the Indian libraries in some metropolitan cities with the help of the computer print- out of the Union Catalogue of Scientific Serials in India coming shortly in the printed form as well. For this purpose individual rank lists were prepared for each year after analysing the docu- ment supply demands received by the DSS (Documen t Supply Service) of INSDOC from 1980-1985. All titles receiving a demand of at least 4 times have been included in the core list of individual years. The data for all the 6 ARUNA KARANJAI USHA MUJOO-MUNSHI INSDOC New IJelhi-ll0067 years were then consolidated and the final list was drawn comprising the identified journals in the field of chemistry and chemical technology. RESULTS a) 131 journals in chemistry and chemical technology (Table 1) were identified, the cutt-off point being 20 demands. b) A list of 50 most cited journals (Table 6) out of the total 131 journals identified were prepared. It was found that 63.14% of requests in the field of chemistry and chemi- cal technology were satisfied by the top 50 journals only in the core list. c) The country of origin of these 131 journals were identified (Table 2). USA was found to top the list followed by USSR, UK, Germany and others. India occupies the 6th position in this list. d) NSL receives 44 journals out of the 131 in the core list (Table 3). It was found that NSL is receiving all the 11 Indian journals identified in the core list. e) 11 Indian journals were identified in the core list, their relative positions being 8,9,45,66,70,91,106,109,111,114 and 117 respectively according to the demands received for them (Table 4). However, these positions of the journals does not reflect the actual demands for them as many libra- ries in India receive them (Table 5). f) Availability of these 131 journals in the 6 metropolitan cities viz. Delhi, Calcutta, Bombay, Bangalore, Madras, Hyderabad were studied from the National Union Cata- logue of Scienrific Serials prin t-ou t (Table 5). The highest concentration of chemistry Ann Lib Sci Docu