Where can I find a complete list of all the functions provided by MIT Scheme?

For example, I discovered by typing at the Scheme prompt that MIT Scheme 
provides the function length=?, but, as far as I can see, it is not documented 
on any of the pages linked to on the MIT Scheme homepage.
https://www.gnu.org/software/mit-scheme/

Such a list would be very useful to save me from writing functions to do 
something already done by a function MIT Scheme provides.

I apologise if this question is too basic for this mailing list: I am new to 
Scheme.

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