Learning, teaching, and research can be effectively achieved when there is very great extent of availability of documentary sources of information resources in the library of unified community. The purpose of this study is to know the extent of availability of documentary sources of information resources in Kogi State University Library, Anyigba, Nigeria. Descriptive survey design was adopted. The instruments of data collection are questionnaire and personal observation. The questionnaire consists of four (4) tables which are based on research questions. Twenty-four (24) copies of questionnaire were administered to the library staff that works in the university library understudy in their various offices. Data were analyzed by use of Likert response rate of 2.50 as criterion mean where ≥ 2.50 is significant (considerable response) and < 2.50 is not significant (inconsiderable response). It was discovered that out of 22 categories of itemized documentary sources of information resources Very Great Extent has 0 (0%); Great Extent has 2 (18.2%); Low Extent has 18 (81.8%). Among the identified challenges are poor budget allocation to the library; insufficient funds; poor donation of documentary sources of information resources to the library; lack of gift on documentary sources of information resources to the library; university management not respond to library needs; absence of standard policy on acquisition of documentary sources of information resources. Recommendations were proffered to ensured very great extent of availability of documentary sources of information resources in University Libraries.