Heaney’s poem is about digging into his family’s history (his father digging potatoes, his grandfather cutting turf). If you download a PDF of Heaney’s Digging , you are, in a metaphorical sense, unearthing the same thematic ground. Make sure to check the table of contents; many compiled PDFs titled "Unearthing Poetry Collections" include Heaney as a featured author.
"Between my finger and my thumb The squat pen rests; snug as a gun."
Here are some recommended unearth poem PDFs to get you started: