In this thesis, I investigate how to enhance a librarycatalogue with a map interface. One method is tomatch catalogue records with a place name gazetteer.The aim of the study is to evaluate this methodon a Swedish collection of resources by creating anprototype, and, to evaluate that prototype from a userperspective.The prototype that was made enables map-based searchingin a collection of resources. It was createdwith catalogue records from Libris and a place namegazetteer from GeoNames. Many of the recordswere linked to one or more points on the map bymatching subject headings from the records and placenames from the gazetteer. I also discuss how to separatebetween different places sharing the same name.I evaluated the prototype with respect to usability. Threeaspects of the concept of usability (learnability,errors, and satisfaction), as they are described by Nielsen,were the basis for the design of the study. Theprototype was tested by five users that carried out threetasks using the prototype.The findings revealed that the interface was not easyto learn. The users encountered several problems, forexample, many had difficulties finding the place theyhad sought for on the map. Nevertheless, four of themwould like to use it again if it had been available. Basedon the findings, I give some recommendations forimproving the interface tested.