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Home: NASA

Overview of the Collection

Finding Reports with Citations

Databases & Indexes

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Using NTRS

Using NTIS

NASA Technical Reports

Using NTIS for "N" Numbers

For certain years, NASA technical reports in microfiche are shelved by a NASA accession number. You need to get that accession number to retrieve your report for those years. Here’s how to do that:

Here's how:

1. If you have the report title, go to the NTIS database and search by report title. When you get to the record for your report, the "n" number you need is listed in the field called "Accession Number."
 
2. If you do not have the title, and have only a report number there are 3 steps:
 
1. Use the NTRS database to search for your report's title. Go to NTRS, use the report number field search in the Advanced Search screen,
 
2. Enter the report number without punctuation, but leaving spaces between elements. For example: TP 2867
 
3. Once you locate the report and get its title, you can search NTIS by the report title to retrieve an "n" accession number.

Below are examples of report numbers converted to "n" numbers.

NASA/TM-1999-208890
NASA Report number NTIS Accession number
N19990019395
NASA-TP-2867 N89161152
NASA-CR-183608 N89210231

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