The edition presents the sources concerning the borders between the Duchy of Słupsk and the Monastic State of the Teutonic Order in Prussia of the 14th and 15thcentury. The basis for the edition are records included in the boundary book – the so called Grenzbuch B with the entry number OF 270a preserved in XX. Hauptabteilung in the Secret State Archive in Berlin-Dahlem. Among the published sources, texts no. 3, 6, 7 were edited by Reinhold Cramer, but they fail to include the dates (no. 6, 7) and the explanations of topographic names appearing in them. The remaining texts were not published (no. 1–2, 4 – 5, 8–12). The first group of sources (no. 1 – 4) was written in the period from the second half of the 14th century to the beginning of the 15thcentury. The second group of descriptions (no. 507) resulted from the circuit [Polish: ujazd] around the boundary by the Gdańsk commander Albrecht, earl von Schwarz-burg of the end of 1405. They were included in the introductory Pomeranian-Teutonic border agreement of 14 October 1407, next in the sealed agreement of 23 Septem-ber 1408. The creation of the third group of descriptions (8–9) should be associated with Teutonic preparations to the arbitration agreement in front of the Roman and Hungarian king Sigismund of Luxembourg, and with the activity of the sub-arbiter Benedict Makrai in the years 1412–1413. The last group of descriptions (no. 10 – 12) was created in the situation of the conflict concerning the establishment of the border between the Człuchów commandry and the Szczecinek land in the vicinity of Dołgie Lake in 1417. None of the published sources presents the whole Pomeranian-Teutonic border from the estuary of the river Łeba to the Baltic Sea in the north to Lędyczek in the south, but its individual fragments. Description no. 1 includes the description of the border between the Człuchów commandry / the Tuchola commandry and the Kingdom of Poland. In source no. 2 there is a list of arbitrators from the Pomeranian party and the Teutonic party negotiating the border between the villages of Oskowo and Siemirowice / Unieszyno. The information about informer and arbitrators may be found in source no. 3 (both the Pomeranian and Teutonic parties) and no. 4 (the Teutonic party). Each of the published descriptions is characterized by precision and plethora of topographic names. They should be used for the analysis of the problem of shaping and functioning of the border between the Duchy of Słupsk and the Monastic State of the Teutonic Order in Prussia in the context of the political and economic situ-ation on the Pomeranian-Teutonic borderland in the Late Middle Ages.