Documents of the Puerto Rico Insular Civil Courts, 1844-1900–UConn
These documents are held at the University of Connecticut Library and presented in digitized form on their website and also through the Internet Archive.
From the cataloging data:
Included are approx. 5000 documents dated between 1840s to the 1890s, many of which are from the Arecibo civil (corte de primera instancia) court districts, covering the full range of cases that might have been brought to civil courts in those times mainly disputes over economic holdings such as land disputes, sale of slaves, and similar materials. The collection includes court cases from the towns of Arecibo, Barceloneta, Camuy, Ciales, Hatillo, Manati, Morovis, Quebradillas, and Utuado.
For more cataloging data and origins of the collection visit the collection page at the University of Connecticut.
The easiest form of access is through the Internet Archive.