permissible velocitypermitpermutationpermutation matrixperpendicular parkingperronpersistentpersonal tripperspectiveperspective centreperspective projectionperspective spaceperturbationperviouspervious blanketpervious groundpervious layerpervious rockpessimistic estimatepesudomoduluspetrifactionpetrographypetroleumpetrologistpetrologyphasephase anglephase planephase projectphasing for movementsphasing for pedestrian movementphasing for through movementphasing for through trafficphenolic resinphonephosphatingphoto basephoto index mapphoto interpretationphoto scalephotoelasicityphotoelasticphotoelastic methodphotogramphotogrammetric mapphotogrammetryphotographphototheodolitephreatic cyclephreatic decline
