^Ancestry.com. New Orleans Passenger Lists, 1820–1945 [database on-line]. Provo, UT, US: The Generations Network, Inc., 2006. Micropublication T905. RG085. Rolls #104. Entry for Blanca Rosa Welter Age 1yr 4 months. Gender Female. Nationality: Dutch. Port of Departure: Tampico, Mexico. Ship Name: Maasdam Port of Arrival: New Orleans, Louisiana. Date of Arrival: Mar 23, 1925.
^Ancestry.com. New York Passenger Lists, 1820–1957 [database on-line]. Provo, UT, US: The Generations Network, Inc., 2006. Year: 1947; Microfilm serial: T715; Microfilm roll: T715_7515; Line: 6;. Entry for: Blanca Welter. Gender Female. Age: 24 years. Port of Departure: Southampton, England. Nationality: Mexican. Place of Birth: Tampico, Mexico. Occupation: Actress. Ship Name: Queen Mary. Port of Arrival: New York, NY. Date of Arrival: Dec 10, 1947.
^Ancestry.com. New York Passenger Lists, 1820–1957 [database on-line]. Provo, UT, US: The Generations Network, Inc., 2006. Year: 1941; Microfilm serial: T715; Microfilm roll: T715_6565; Line: 9; .Entry for: Blanca Rosa Welter. Gender: Female. Age: 17. Nationality: Dutch. Occupation: Student. Place of Birth: Tampico, Mexico. Port of Departure: Cape Town, South Africa. Ship Name: President Monroe. Port of Arrival: New York, NY. Date of Arrival: July 31, 1941. Editor's note: if she was 17 in July 1941, that would mean she was going to turn 18 that November; another confirmation of 1923 as her year of birth.