https://cris.haifa.ac.il/en/publications/repeat-and-non-returning-volunteers-the-promise-of-episodic-event/
Repeat and Non-returning Volunteers: The Promise of Episodic Events for Volunteer Recruitment and...
returning volunteersthe promiserepeatnonepisodic
https://keyt.com/news/2019/10/23/elephant-seals-returning-to-san-simeon-california-state-parks-seeking-volunteers-to-act-as-guides/
Elephant seals returning to San Simeon, California State Parks seeking volunteers to act as guides...
Oct 23, 2019 - The elephant seals are returning to San Simeon, and local wildlife experts are getting ready. Experts say as many as 17,000 of the large seals take over
california state parkselephant sealssan simeonseeking volunteersreturning