Getting weekly and monthly stock price data

guys, can anyone pls guide me to a free source of historical weekly and monthly stock prices, just like we get in BSE. I am unable to decipher the URL of BSE to automate it and therefore, looking at other resources. I know how to get daily historical prices for equities from yahoo/google but i am not getting the weekly and monthly data from them. Any other free resource that people can point out to?

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