A. H. Bull Steamship Company (English Wikipedia)

"Sea Lane Vigilantes". www.armed-guard.com.
World War II U.S. Navy Armed Guard and World War II U.S. Merchant Marine, 2007-2014 Project Liberty Ship, Project Liberty Ship, P.O. Box 25846 Highlandtown Station, Baltimore, MD [1]

baltimoreheritage.org

explore.baltimoreheritage.org

Kempf, Sydney. "A. H. Bull & Company - Steamships From New York to Puerto Rico". Explore Baltimore Heritage.
Kempf, Sydney. "A. H. Bull & Company - Steamships From New York to Puerto Rico". Explore Baltimore Heritage.

baltimoresun.com

Kelly, Jacques (5 April 2016). "Path of light sparks memories of Baltimore piers' role as window to the world". The Baltimore Sun.

casetext.com

"Ericsson Line v. United States, (1956), 139 F. Supp. 742 | Casetext Search + Citator". casetext.com.

cecilcountyhistory.com

"ericsson line Archives". 23 October 2014.

cecildaily.com

"Ask the Historical Society: Steamboat schedule". Cecil Daily. 31 May 2014.

concreteships.org

concreteships.org, John Smeaton

cruiselinehistory.com

Grace, Michael L. "The Bull Lines and the mid-century S.S. Puerto Rico".

crwflags.com

"House Flags of U.S. Shipping Companies: B". www.crwflags.com.

geni.com

"Charles Henry Mallory". geni_family_tree. 29 April 2022.

ha.com

historical.ha.com

"historical.ha.com, Agwilines Inc".

hsp.org

discover.hsp.org

"Baltimore and Philadelphia Steamboat Company records 1844-1936". discover.hsp.org.

mariners-l.co.uk

"WWI Standard Ships War J". www.mariners-l.co.uk.
"LibShipsR". www.mariners-l.co.uk.
"WWI Standard Ships War P". www.mariners-l.co.uk.
"LibShipsT". www.mariners-l.co.uk.
"vicshipsH". www.mariners-l.co.uk.
"vicshipsM". www.mariners-l.co.uk.
"vicshipsA". www.mariners-l.co.uk.
"vicshipsT". www.mariners-l.co.uk.
"LibShipsZ". www.mariners-l.co.uk.
"LibshipsB". www.mariners-l.co.uk.
"LibShipsJon". www.mariners-l.co.uk.
"LibShipsS". www.mariners-l.co.uk.
"LibShipsN". www.mariners-l.co.uk.
"LibShipsF". www.mariners-l.co.uk.
"LibShipsG". www.mariners-l.co.uk.
"LibShipsP". www.mariners-l.co.uk.
"LibShipsC". www.mariners-l.co.uk.
"LibShipsH". www.mariners-l.co.uk.
"LibShipsW". www.mariners-l.co.uk.
"LibShipsL". www.mariners-l.co.uk.
"LibShipsJo". www.mariners-l.co.uk.
"LibshipsA". www.mariners-l.co.uk.
"LibShipsE". www.mariners-l.co.uk.

mysticrevealed.com

"Elihu Spicer and the Spicer Mansion". Mystic Revealed.

navsource.org

nc-wreckdiving.com

"Wreck of the Manuela". www.nc-wreckdiving.com.

paddlesteamers.info

"Hudson River Paddle Steamers".

redhookwaterstories.org

"Ad: Porto Rico Line". Red Hook WaterStories.

shipscribe.com

shipscribe, Edith

shipsnostalgia.com

"ANGELINA". Ships Nostalgia. 10 March 2020.

theshipslist.com

"A. H. Bull & Company / Baltimore Insular Line". www.theshipslist.com.
"Mallory Line / Clyde-Mallory Line". www.theshipslist.com.

timetableimages.com

"Porto Rico Line - New York & Porto Rico Steamship Co. - Nels Helgesen". www.timetableimages.com.
"Cuba Mail Line - New York and Cuba Mail Steamship Co. - Ward Line". www.timetableimages.com.
"Porto Rico Line - New York & Porto Rico Steamship Co. - Nels Helgesen - Coamo - Puerto Rico - San Juan - San Jacinto - San Lorenzo". www.timetableimages.com.
"Maritime Timetable Images - Exterior views of ships". www.timetableimages.com.
"Baltimore & Carolina Steamship Co". www.timetableimages.com.
"Mallory Steamship Company - Mallory Line". www.timetableimages.com.

uboat.net

"Ruth (American Steam merchant) - Ships hit by German U-boats during WWII - uboat.net". uboat.net.

usdeadlyevents.com

"1942 — June 17, US freighter Millinocket sunk by U-boat off La Isabela no. coast Cuba– 11 – Deadliest American Disasters and Large-Loss-of-Life Events". 17 June 1942.

usmm.org

"American Flag ships in foreign trade or trade with U.S. possessions as of April 1939". www.usmm.org.