Copies of the book "The Vassel-Kipke Families of Brazil" and "Our Vassel-Elmer Heritage: The Story of Bruno II & Mary Erety Elmer Vassel" both written by Mary Erety Vassel Hill were donated to the Family History Library in Salt Lake City, Utah with permission to copy them as digital copies.
As of March, 2023 both books are now available is digital format at www.familysearch.org at the following links:
"The Vassel-Kipke Families of Brazil"
https://www.familysearch.org/search/catalog/4316437?availability=Family%20History%20Library:
