Treesearch is the Best

I really like Scholar Google for finding research, but an all time favorite is Treesearch.  More than just trees mind you, but a whole slew of social and natural resource management stuff.  And in January they reached a milestone "As of January 2018, the Forest Service has added more than 50,000 full-text peer-reviewed publications to Treesearch, an online source for agency science publications."

Check out Treesearch.