We have measured the doubly differential cross section sd2&sgr;/dtdM2for the reaction p + p ⇒ p + X using 200 GeV incident protons in the external beam at NAL. The ranges covered in ∣t∣ and M2are0.019 < ∣t∣ < 0.19 GeV2and1 < M2 < 60 GeV2respectively. The hydrogen cross section was obtained by a polyethylene‐carbon subtraction and is given with appropriately large statistical uncertainties. However, the cross section does show unexpected structure. In the region7 < M2 < 19 GeV2the cross section reaches a maximum near∣t∣ ∼ 0.1 GeV2and then decreases for smaller ∣t∣.