L. J. Pen

• A systematic overview of environmental values of the wetlands, rivers and estuaries of the Busselton-Walpole Region
• Managing our rivers
• Peripheral vegetation of the Swan and Canning estuaries 1981
• Planning & management
• Survey of river foreshores in the Oyster Harbour Catchment, 1997
• The condition of the Kalgan River foreshores, 1992/93
• The fringing vegetation of the Wilson Inlet delta, 1946 to 1994