Link to journals including emigration. http://zs.thulb.uni-jena.de/content/main/journalList.xml#A
Emigrants in the 1850s: http://www.germanimmigrants1850s.com/
Wollmershäuser, Friedrich. Passengers listed in the Allgemeine Auswanderungs-Zeitung 1848-1869. FHL 943 W3w.
Emigration lecture by Roland Geiger from St. Wendel on YouTube: Lecture 2021
Immigrant Entrepreneurship: https://www.immigrantentrepreneurship.org/overviews/volume-1-preface/