Bernt Maehlum has written:

'The sporadic E auroral zone' -- subject(s): Auroras, Sporadic E (Ionosphere)

'Small scale structure and drift in the sporadic E layer as observed in the auroral zone' -- subject(s): Auroras, Sporadic E (Ionosphere), Ionospheric radio wave propagation

Hal E. Goodyear has written:

'Results of experimentation with phytohormones in the propagation of forest trees' -- subject(s): Propagation, Plant hormones, Trees

W. E. Guse has written:

'Propagation from bulbs, corms, tubers, rhizomes, and tuberous roots and stems' -- subject(s): Plant propagation, Bulbs (Plants), Tubers, Corms

The lackluster battle was punctuated by sporadic mortar fire.

His aim was sporadic and the bullet holes were scattered randomly.