https://opg.optica.org/ Download this publisher's e-journal holdings (xlsx) Content Type OA ? PCA ? Journals Yes No 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-Journals All0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ Titles start with P (1) ISSN Status Photonics Research 2327-9125 queued