Add the words: records, papers, archives, digital collection
Add the limit "site:.[domain]". For example, adding "site:.gov" will limit to government websites/information. .gov, .edu, and .org are good limits.
International topics: add a country code limit and use Google translate.
Archives: 1. Materials created or received by a person, family, or organization in the conduct of their affairs. 2. A repository that collects the records of individuals, families, or other organizations.
Finding Aid: A collection description to provide access to and understand the materials.
Manuscripts: Handwritten or unpublished document.
Personal Papers: Documents created, acquired, or received by an individual or family in the course of his/her/their affairs.
Records: Written or printed works of a legal or official nature that may be used as evidence or proof, created by organizations or corporations.