http://www.knowledgeunlatched.org/ Content Type OA ? PCA ? Books (Back List, Front List) Yes Yes Request a holdings comparison Portico provides a free holdings comparison service to compare a library’s journal or book holdings to the Portico archive. Search titles and ISSNs by keyword: Show: E-Books All0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ Titles start with V (1) Information Verse and transmutation Author/Editor: Timmermann, Anke.