The turn of the century saw Jeppe embarking on an endeavor that would take a few years to accomplish and most of his time. This project was the biography of Steen Steensen Blicher. With the support of Gyldendal, he spent countless hours, weeks, and months perusing archives, throughout the country. The work, "Steen Steensen Blichers Livs-Tragedie i Breve og Aktstykker" (Steen Steensen Blicher's Life Tragedy in Letters and Documents, 1903-1904) was released in subscription style with a total of 36 volumes. The piece was not financially successful; however, in time it came known to be a literary masterpiece, and a major contribution to Danish literary history. His next project deviated from his typical fare and in 1905 and 1906, he released a series of poetic pieces: "Fri Felt: En Digstamlin" (Open Field: A Poem Collection, 1905), "Rugens Sange og Andre Digte" (Songs of the Rye and Other Poems, 1906). The second book was generally considered to be his best work ever, and it contains "Jens Langkniv" (Jens Longknife). He wrote these poems while living with friends, and instead of a political slant, they dealt with the beauty of rural life. He would later reminisce about inspiration for the poems being long walks by himself, where he would stamp out the rhythm with his feet as he was creating the words. A lot of the inspiration came from Robert Burns, who Jeppe felt was able to capture the nuances of rural dialect, the beauty of the land, the emotions of the farmers life, and the day-to-day rhythms of the existence. In his piece, "Esper Tækki: En Sallingbo-Empe" (Esper Tækki: A Salling Imp, 1913), he drew on Robert Burns' poem "Tam O'Shanter".