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There is no perfect way to search the library catalog to find all reference grammars for a given language, but the following are a couple of strategies that should yield good results. I'm happy to help you find what you need. Feel free to email me or make an appointment!
A Subject search for [name of language] language grammar should find most of what we have for that language, but it will also pull up some results that aren't reference grammars, so you'll need to browse the results to find what you need. Here's an example (click the image to see the search in the catalog):
A keyword search for [name of language] AND "reference grammar" will usually find at least one source for many languages, but it will miss a lot of others if they don't have the phrase "reference grammar" somewhere in the title or description of the book. Here's an example (click the image to see the search in the catalog):
Change the drop-down menu next to the search box from Entire collection to Online/electronic to see only materials that you can access online.
Try it out!