This collection of 26 presentations on library cooperation from the 1979 meeting of the International Association of Technological University Libraries (IATUL) includes the following: "Is Cooperation a Good Thing?" by M. B. Line; "The Organisation of Co-Operation" by M. R. van Gils; "Co-Operation in Library and Information Service: The Role of Intergovernmental Organisations" by Elin Tornudd; "Cooperative Collection Development" by J. E. Skipper; "DOBIS at the Bibliocentre" by Doreen E. Carpenter; "New Aspects and Trends in Interlending in the Federal Republic of Germany" by J. Heydrich; "The Swedish LIBRIS System" by L. Gardvall; "The PICA Catalogue System" by L. Costers; "Cooperation in Library User Education" by Nancy Fjallbrant; "Teaching Library Co-Operation to Library Students" by B. Rugaas; "The Experimental Scientist and His Literature Searches" by D. A. A. Mossel; "Presentation of Twente Technological University Library" by G. A. Hamel; "Cooperation as a Solution to the Problems of European Community Documentation" by Mike Hopkins; and "Interaction of Online Users" by C. van de Weteringh. An abstract is provided for each paper as well as a summary of discussion following its presentation. (FM)