I thought this too at first, but it turned out to be just a problem with my browser&#x27;s rendering (Opera).  Saving it to disk and viewing with Preview on Mac produced the missing pages.<p>If that doesn&#x27;t work, there&#x27;s a different PDF available here that might produce better results (facing pages rather than single): <a href="http:&#x2F;&#x2F;web.mit.edu&#x2F;zoz&#x2F;Public&#x2F;ebook_Ignition_An_informal_history_of_liquid_rocket_propellants_John_D_Clark.pdf" rel="nofollow">http:&#x2F;&#x2F;web.mit.edu&#x2F;zoz&#x2F;Public&#x2F;ebook_Ignition_An_informal_his...</a>