How did the Japanese view the Chinese in the 1930s?

I've read numerous books on WWII and the Second Sino-Japanese war, I haven't been able to find how they view the Chinese is the 1930s. I know during the war the Japanese viewed the Chinese as lesser being and that can be seen in instances of the Nanking Massacre, at Unit 73, and in other war crimes instances. However, I'm looking for when that started, was it in the 1930s or sooner. I've read books by John Toland,Rana Mitter, and others, but still haven't found it. If anyone has a sources that they could share or suggest that would be great.
Answers

The Lord Humungus.

As Sub humans All you need to do is search out the writing of the Japanese fascists, which are usually a bundled resource by a university press.

Anonymous

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