Shepherds wandering through the olive trees.
Interesting factoid: Hulett lived in La Crescenta, which is in a long narrow valley north of Los Angeles. When he moved thre in the early 1950s, La Crescenta still had grape vineyards and olive groves, and there were olive trees on the property where he built his house.
So the olive trees in this card? They're drawn from life. But they aren't the olive trees of the Holy Land, but of La Crescenta in Southern California.