iseseisev raamatukogu, mille ülesanne on informatsiooni hankimine ja vahendamine ühe teatud eriala või ainevaldkonna kohta või mingi kindla piirkonna huvides, a library primarily serving one discipline or particular field; a library primarily serving a specific category of users; a library primarily devoted to a specific form of document, a library established and funded by a commercial firm, private association, government agency, nonprofit organization, or special interest group to meet the information needs of its employees, members, or staff in accordance with the organization's mission and goals, bibliothèques qui relèvent d'une association, d'un service gouvernemental, d'un parlement, d'une institution de recherche...,la plus grande partie de leurs collections concernant une discipline ou un domaine particulier