Programming Python Mobi too big

I just purchased the Programming Python 4th Edition. I was trying to install it on the Kindle and the Kindle app wont load a Mobi over 50 mb . As this is not Oreilly issue directly it seemed odd to me that I sent the same book as PDF and it was only 20mb.

If you have any suggestions or solutions other then Mobi or PDF please let me know.

I understand this is a big honkn' book just thought you should know.
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