To batch export datastreams for newspaper issues, use the Islandora Datastreams I/O (information in this Arca Minute). Select the Solr Query option and enter the following text: RELS_EXT_isMemberOf_uri_mt:"PID" (replacing "PID" with the PID for the newspaper collection). This will export all of the child objects for that newspaper. For example, to make batch metadata edits, select the MODS datastream.