The coordinated and concerted use generate -based digital resources and services. (Help build this listlet me know what types of resources are missing!) Evaluating Resources. Introduction to Library ResearchAdvanced EvaluationTypes of (free) resources. I. Different based resources contents enrichments that led to modified and newly dded -based library a services. Some sites are created by an expert or by a group of experts, while others are created by laypersons or amateurs. The article touches