Investors & landlords

I have four 1099-MISC. On each 1099-MISC the only thing listed in any of the boxes is in Box 2 (royalties). No taxes of any kind are listed on any of the four 1099-MISC.  I have each reported separately on my income tax form right now.  I paid one lump sum to the county in TX where the mineral rights are located. My issue is how am I supposed to know how much of that lump sum is to go to "expenses" on each of the four separate royalties? You guys keep saying to list the taxes I paid as "expenses" on each royalty payment, but I don't have that information. Just the "x" amount that I paid to the county.