This report describes manuscript preparation and submittal procedures and style/formatting guidelines for manuscripts submitted to the National Park Service Natural Resource Report series (NRR), Natural Resource Technical Report series (NRTR), and Natural Resource Data Series (NRDS). It is a revision of an earlier report: Instructions to Authors - Natural Resource Report and Natural Resource Technical Report: Version 2.4 (NPS 2006). The addition of the newer NRDS report series warranted a change in the report title. Other differences between this document and previous revisions include procedural changes due to the integration of NatureBib into the Natural Resource Information Portal (NRInfo) document storage and retrieval system, additional information for using MS Word format styles, and general edits to clarify and better reflect current policies.