Re: Julia Emmaand John W. Manning
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I didn't find them on the 1930 Census, FamilySearch, Washington State Digital Archives or anywhere else.
YOu can send a research query to the Clark County Genealogical Society, www.ccga-wa.org/ and ask them to look for them especially on the microfilm copy of the Washington State Death Index.
You can also search the cemeteries in Clark Co. at the same web site as above and see if they appear in any. Successful Searching!