▁bro oding ▁habitat ▁in ▁south western ▁North ▁Dak ota , ▁North ▁Dak ota ▁Game ▁and ▁Fish ▁Department , ▁Le k . ▁( 2 0 1 0 ). ▁In ▁Mer ri am - Web ster ▁Online ▁Dictionary . ▁Retrieved ▁April ▁ 1 6 , ▁ 2 0 1 0 , ▁from ▁http :// www . mer ri am - web ster . com / dictionary / lek ▁Lim b , ▁R . F ., ▁K . R . H ick man , ▁D . M . ▁Eng le , ▁J . E . ▁Nor land , ▁and ▁S . D . ▁Fu hl endorf . ▁ 2 0 0 7 . ▁Digital ▁phot ography : ▁Red u ces ▁investig ator ▁variation ▁in ▁visual ▁obst ruction ▁measurements ▁for ▁southern ▁tall gr ass ▁pra irie . ▁Range ▁land ▁E col ogy ▁Management . ▁ 6 0 : ▁pp .   5 4 8 – 5 5 2 . ▁Mans ke , ▁L . ▁L .; ▁W . ▁T . ▁B ark er . ▁ 1 9 8 7 . ▁Hab itat ▁Us age ▁by ▁pra irie ▁gr ouse ▁on ▁the ▁She y enne ▁National ▁Gr ass lands . ▁pp .   8 – 2 0 . ▁In : ▁A . ▁J . ▁B j ug stad , ▁te ch . ▁coord . ▁Pra irie ▁Ch ick ens ▁on ▁the ▁She y enne ▁National ▁Gr ass lands . ▁Gen . ▁Te ch . ▁Rep . ▁R M - 1 5 9 . ▁Fort ▁Collins , ▁CO :