In order to identify a bibliography of an entire institution in Slovenia through COBISS/COBIB/OPAC it is necessary to conduct advanced search queries by combining complex criteria which are presented in the article. The total number of publications (records) by the Department of Wood Science and Technology of the Biotechnical Faculty during 1980-2009 was identified, and thoroughly assessed by document types, languages, and number of records by each particular researcher. Altogether 5150 records were identified, with 1660journal articles published in 146 different journals. Core five journals accounted for more than 1000 articles. There is a high number of the so called Monographs and Other Completed Works, which also cover student theses, but many "monographic" documents contain one page only and are not publicly available. Several authors have produced several hundred documents each. Document types are not always assigned according to uniform criteria and it is frequently not possible to distinguish a difference among certain types. The real involvement of an author is not immediately evident because the same document type assigned to an author can imply different roles, such as a primary author or a mere peer-reviewer. COBISS-linked SICRIS must be used for better assessment of bibliographies of individual authors. The institutions, however, can only be assessed through COBISS/OPAC but the results must be interpreted with caution.