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- [35] Protecting and defining our national security in a changed world PREPARING AMERICA'S FOREIGN POLICY FOR THE 21ST CENTURY, 1999, : 115 - 129
- [37] Our national parks (cont'd) (Response to William Hewitt) PRESERVATION, 1998, 50 (03): : 12 - 12
- [39] GEOLOGICAL ASPECTS OF OUR NATIONAL PARKS II. PARKS ALONG THE CONTINENTAL DIVIDE AND EASTWARD SCIENTIFIC MONTHLY, 1941, 53 : 211 - 226
- [40] Snowmobiles, cell towers in national parks? (Response to the editorial, "Do many of our national parks provide a ture wilderness experience?") LANDSCAPE ARCHITECTURE, 2004, 94 (07): : 13 - 13