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My goal is to find articles related to invasive species management on a monthly basis. I have a list of species for my region (i.e keywords) and a list of journals. Although I enjoy combing through new issues of each journal, I'm wondering if there is a more automated, and less time consuming method.

I've tried using Boolean operators in Google Scholar, but this limits the search to 2019 (not monthly) and isn't journal specific. I have also explored some programs (e.g. Stork), with limited results.

Any insight is greatly appreciated. Thanks!

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In case the journals are indexed by PubMed ( biomedical literature) and you're not afraid to do a bit of programming, you might want to explore the tools proposed here. You can even download the full Medline database (see here) and search through it locally, in case that's more convenient.

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As far as I know you can only limit Google Scholar searches by year, not by month. This might still be fine for a specific enough search, as you can just tell from a glance what's new or not*. To keep it specific, you might want to do several search queries for different keywords instead of chaining the keywords together using Boolean operators. What will really help you, however, is to use the source qualifier to limit results to a specific journal. You can also search in several specified journals using a query like

"invasive species management" OR "biological invasion" (source:"ecology letters" OR source:"ecological economics")

In case the journals you're interested in have names that overlap with other journals, see this question.

*If not, you could presumably automate the queries, and compare the results to a cached version from the previous run. Would certainly be more involved than just a search query though.

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