Problems with Amazon Book Search for free books
This should and does find all Kindle book at zero price from Publisher Venture Press
https://www.amazon.com/s/?url=search...=venture+press
This adds Or Endeavour Press and worked up to Yesterday
https://www.amazon.com/s/?url=search...ndeavour+press
And now gives a HTTP 400 Bad request as does the full four publisher version
https://www.amazon.com/s/?url=search...ice=0-0&field-
publisher=venture+press|+endeavour+press|+Pioneeri ng+press|+the+Odyssey+press*
That's using IE11 browser, the Firefox browser just gives a blank screen
Same with Amazon.ca and Amazon.co.uk
Any ideas?