The good folks at LogoDesignLove have made a compilation of many branding guidelines of a lot of institutions. This extensive list includes from Mozilla Firefox to Walmart style guides, which may be a very good source of inspiration for logo designers out there. It's also interesting to see how each of these brands approach their visual language, something to take in consideration when starting your own business. Go check out the rest of the list at the source, here you have some examples:
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