Washigton for Washington continues our mostly geographic theme this week. It can be found on the B or high probability list at Typographical Errors in Library Databases at http://faculty.quinnipiac.edu/libraries/tballard/Sectionb.html.
This omitted letter typo is not likely to be a deliberate mistake, but we must add the standard disclaimer. Do not take out any typo in your catalog without looking at the individual records to see the nature of the error.
If the word is followed by "sic" then it is a publishing error, and it should remain in the record.
Given that there are 188 hits for Washigton in WorldCat, we'd say there is a good chance that this will be found in your catalog.