A handbook of the principal trees and shrubs of the Ancon and Balboa Districts, Panama Canal Zone, subdivided into sections according to location of plants. - Canal Zone.; Johansen, Holger ([Washington], 1925)
On cover: Trees and shrubs of Ancon and Balboa Districts, Canal Zone.
Preface signed: Holger Johansen.
Includes index.
Keywords: Botany -- Panama