German immigration to Puerto Rico (English Wikipedia)

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"Casa Bavaria". Condé Nast Traveler. December 1, 2022. Retrieved December 30, 2023.

cohrs.de

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Josefrios18 (4 June 2007). "Iglesia Episcopal Puertorriqueña". credo-josefrios18.blogspot.com. Retrieved 21 April 2018.{{cite web}}: CS1 maint: numeric names: authors list (link)

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Zwickel, Daniel B. "Gutiérrez del Arroyo Sisters". www.peacehost.net. Retrieved 21 April 2018.

"El primer árbol de Navidad en Puerto Rico". www.preb.com. Retrieved 21 April 2018.
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"Tour Magazine". tourmagination.com. Archived from the original on 9 May 2008. Retrieved 21 April 2018.

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The History of the Christmas Tree Archived December 23, 2006, at the Wayback Machine
"Tour Magazine". tourmagination.com. Archived from the original on 9 May 2008. Retrieved 21 April 2018.
Pacific News Archived 2007-09-30 at the Wayback Machine
Botanical Legacy of Dr. Agustín Stahl Archived 2011-09-17 at the Wayback Machine, Retrieved October 17, 2008
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"German Missions in the United States - Honorary Consul". Archived from the original on 2016-03-03. Retrieved 2016-08-09.