What has the author Delos E Toole written?

Delos E. Toole has written:

'Gold nugget-teering and prospecting in Northern California'

'Where to find Yankee placer gold' -- subject(s): Gold mines and mining, Placer deposits

'Gold Nugget-Teering and Prospecting in Nevada'

'Where to find gold in Oregon' -- subject(s): Gold mines and mining, Prospecting