My first stop is always bookfinder. Doesn't cross-reference every site but it does a good chunk of them. Source: 12 months ago

If an era (say civil war) go to http://bookfinder.com. Now on the front page click Advanced Search. You can select year of publication. So for civil war I would plug in up to 1900. Source: about 1 year ago

First you need to learn to grade the book, as value is related directly to condition. Then you can look the book up on bookfinder.com and see what it's worth. But... there's a caveat. There's lots of "script sellers" out there, sellers that don't actually own the book - but which scrape the data, markup the price and offer it for sale, planning to buy it when you do. There's also many utter idiots who will... Source: about 1 year ago

If you NEED to purchase a book, use bookfinder.com to find the cheapest books. Always verify the ISBN to make sure you get the correct one edition. Source: about 1 year ago

You should also check bookfinder.com. Source: about 1 year ago

A few may know, that google scholar(https://scholar.google.com/) does not offer a feature for arranging the search results based on the number of citations. Several years ago, one developer published a Python code (https://github.com/WittmannF/sort-google-scholar) to handle this. I had been inspired by his work, but I wanted to show the list of... - Source: Hacker News / about 2 months ago

To that point, https://scholar.google.com/ is still useful. - Source: Hacker News / 4 months ago

1) find the doi number [1a][1b] 2) find sources that cite the doi number -> google scholar[2][3] 3) filter for 'github' ----- [1a]resolve a doi name : https://dx.doi.org/ [1b]find a doi number : https://answers.lib.iup.edu/faq/31945 [2] : https://scholar.google.com/ [3] : google with "site:http://doi.org/" [4] : finding a doi in document page :... - Source: Hacker News / 5 months ago

Half of those are about science, during my Ph.D., I was told to use scholar.google.com, which works great as far as I can tell. Couple it to sci-hub and you get all the scientific literature you need. Source: 6 months ago

Scholar.google.com exists also which is what you use for studies. Source: 6 months ago