SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

SIP Approval: Pennsylvania (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Erie area). 

FWS proposed to list two distinct population segments of the lesser prairie-chicken as threatened or endangered under the ESA. 

FWS proposed to list two distinct population segments of the lesser prairie-chicken as threatened or endangered under the ESA. 

FWS proposed to list two distinct population segments of the lesser prairie-chicken as threatened or endangered under the ESA. 

FWS proposed to list two distinct population segments of the lesser prairie-chicken as threatened or endangered under the ESA.