| Sources |
- [S1210] Ancestry.com, Maryland, U.S., Wills and Probate Records, 1635-1777, (Name: Ancestry.com Operations, Inc. Date:2015 Place:Provo, UT, USA;), 1,9068::0.
- [S488] Ancestry World Tree Submissions at www.ancestry.com.
- [S1368] Skordas, Gust, The Early Settlers of Maryland (Baltimore: Genealogical Publishing Co., c1968).
- [S1323] Coldham, Peter Wilson, Settlers of Maryland (Genealogical Publishing Company, 4 volumes.).
- [S780] Robinson, Dierdre, Kaeling, BIrkel, Kellar, Morrissey, Anderson, Butler, Woodward, Rutter, Mayberry---MD, NJ (Sources "Mareen Duvall of Middle Plantation" by Harry Wright Newman, c.1952, reprinted 2000 by Carl P. Brown, Pittsfield, MA).
- [S1322] Hammers, Marian G. Duvall, Some Descendants of Mareen Duvall, The Emigrant, and Allied Names, Cooper, Elliott, Fairlie, Blount, Yates and Piedfort Madisonville, KY, c1984 (quotes "Maryland Heraldic Families 1634/1635").
- [S781] Newman, Harry Wright, Mareen Duvall of Middle Plantation (c1952, reprinted in 2000).
- [S817] World Family Tree at www.ancestry.com.
- [S97] Ancestry.com, Colonial Families of the USA, 1607-1775, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2016;).
- [S13] Ancestry.com, England, Select Births and Christenings, 1538-1975, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;).
http://familysearch.org/pal:/MM9.1.1/NFTN-4V9
- [S860] Ancestry.com, Web: Maryland State Archives, Index to Deaths and Burials, 1697-1800, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2020;).
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https://www.findagrave.com/memorial/120787264/john-duvall
- [S505] I.G.I. Files at the Mormon Family History Centers and at www.familysearch.com.
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