Below are some search strategies to try when looking for technical reports - either by topic or for specific (known) titles - in the engineering and physical sciences.
Depending on the topic being searched, review the database listings in this guide and select one or more relevant databases to search. Note that there may be specialized search features or filters, depending on the database and its coverage.
Use Google Books to check for original citations that may have been published in a more contemporaneous index.
Use Google Scholar to check for other citations of the known item to see if additional information is included or to confirm the citation information you have.
Keep an eye out for translated or transliterated versions of the title being searched.