Project Extraterrestrial was a research project founded by the European commission, and in the documentation, which is freely available on the Internet, is a lot of valuable Pinus sylvestris and Picea abies collections and chronologies from Sweden, Finland, Russia, and Estonia available. Some of them not available elsewhere. The format is excel (.xls), in which some different data formats is pasted. The scope of the project was: External factors forcing conifer growth variability at different frequencies during the Holocene in Northern Europe and application to ensure sustainable forest management.", a Research project funded by the European commission. Contract No: ERBIC15CT980123.
The entry to the data sets are found at http://www.geol.lu.se/personal/hsl/netsc/Database/database.htm (WebCite-archive)