38b refers to a specific stanza or folio within the manuscript transmission (often the "F" manuscript).
This specific stanza is part of a larger corpus analyzed for its metric structure and linguistic nuances in Old Spanish. Identifying Your Specific File Lv 38b 52 jpg
(like a needle or carved bone) against a neutral background with a scale bar, it is the archaeological plate . 38b refers to a specific stanza or folio