A great source of information in researching Ashton Valve has been old trade journals. They are loaded with many articles and advertisements. Here are some of the ones I have utilized.
https://www.smokstak.com/forum/showthread.php?t=187143
I've recently come across these journals in my researach.
http://railroadfan.com/phpbb/download/file.php?id=3223&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3221&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3233&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3318&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3316&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3320&mode=view
http://railroadfan.com/phpbb/download/file.php?id=3319&mode=view
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