Mass-identified particle production in proton-antiproton collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>300</mml:mn><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mn>5</mml:mn><mml:mn>4</mml:mn><mml:mn>0</mml:mn><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mn>1</mml:mn><mml:mn>0</mml:mn><mml:mn>0</mml:mn><mml:mn>0</mml:mn><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi mathvariant="normal">and</mml:mi><mml:mi> </mml:mi><mml:mn>1800</mml:mn></mml:math>GeV

The yields and average transverse momenta of pions, kaons, and antiprotons produced at the Fermilab $\overline{p}p$ collider at $\sqrt{s}=300, 540, 1000, \mathrm{and} 1800$ GeV are presented and compared with data from the energies reached at the CERN collider. We also present data on the dependence of average transverse momentum $〈{p}_{t}〉$ and particle ratios as a function of charged particle density $\frac{d{N}_{c}}{d\ensuremath{\eta}}$; data for particle densities as high as six times the average value, corresponding to a Bjorken energy density 6 GeV/${\mathrm{fm}}^{3}$, are reported. These data are relevant to the search for quark-gluon phase of QCD.