Leonora Piper's proxy sittings?

#1
I have read some people on the Internet say that Leonora Piper has seen proxy sitters. I could not find any specific instances of this in the literature so far; all I could find with proxy sittings is Gladys Osborne Leonard. Would anyone be able to point me out to some places where Piper has been through proxy sittings, with the citations? Thank you.
 
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