Sor’s Le calme op. 50 is a long and interesting work, first published in Paris in about 1832.
The piece entitled Meditación, published in an appendix in this edition, may be derived from this work.
This edition comes from the new 2020 second edition of Sor’s New Complete Works for Guitar edited by Brian Jeffery. The Introduction and Index to the entire series can be seen here on this site.