There are major microfiche collections of federal government technical reports at the CSU library. Most are now housed in "Storage Microtext Fiche" and will need to be requested through the library catalog. Any fiche housed in Morgan library can be located in Microforms (lower level/basement, North), which are in cabinets arranged by call number.
The individual reports can be found in the library catalog (Sage). Many series are ongoing. The more extensive include:
C55.13/2: NOAA Technical Memorandums
E1.28: DOE Contractor Research and Development Reports
E1.99: DOE Contract Reports and Publications
NAS 1.15: NASA Technical Memorandums
NAS 1.26: NASA Contractor Reports