All Open Road
http://www.amazon.com/s/ref=nb_sb_noss_2?url=node%3D9578129011&field-keywords=open+road
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PFD Books:
http://smile.amazon.com/s/ref=sr_nr_p_n_feature_nineteen_0?rh=n%3A133140011%2Cp_30%3Apfd+books%2Cp_n_feature_nineteen_browse-bin%3A9045887011&bbn=133140011&sort=relevanceexprank&unfiltered=1&ie=UTF8&qid=1411672233&rnid=9045886011
Nicholas Blake, Margery Allingham, Edmund Crispin, Jane Aiken Hodge
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Scholastic
http://smile.amazon.com/s/ref=nb_sb_noss_1?url=node%3D9578129011&field-keywords=scholastic
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Pinnacle Press
Action thrillers
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PM Press
http://smile.amazon.com/s/ref=nb_sb_noss_1?url=node%3D9578129011&field-keywords=PM+Press
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Mariner Books publishing
http://smile.amazon.com/s/ref=sr_nr_p_n_feature_nineteen_0?rh=n%3A133140011%2Cp_30%3Amariner+books%2Cp_n_feature_nineteen_browse-bin%3A9045887011&bbn=133140011&sort=relevanceexprank&unfiltered=1&ie=UTF8&qid=1412724713&rnid=9045886011
Ruth Galloway series
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Endeavour Press
British publisher - mysteries
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Open Road Media with Whispersync available.
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SourceBooks is another good publisher search in Kindle Unlimited
http://smile.amazon.com/s/ref=nb_sb_noss_2?url=node%3D9069934011&field-keywords=Sourcebooks
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Pegasus
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University of Queensland Press (Australia)
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Chicago Press has some offerings as well
http://smile.amazon.com/s/ref=sr_st_review-rank?keywords=chicago+review+press&qid=1409858196&rh=n%3A133140011%2Cn%3A!133143011%2Cn%3A9578129011%2Ck%3Achicago+review+press&sort=review-rank
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Charles River
(history offerings)
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