virtual/boot :: boot
virtual/class :: class
virtual/cluster :: cluster
virtual/codetools :: codetools
virtual/foreign :: foreign
virtual/KernSmooth :: KernSmooth
virtual/lattice :: lattice
virtual/MASS :: MASS
virtual/Matrix :: Matrix
virtual/mgcv :: mgcv
virtual/nlme :: nlme
virtual/nnet :: nnet
virtual/rpart :: rpart
virtual/spatial :: spatial
virtual/survival :: survival