We present high resolution ( R = 60,000 ) measurements of the NaI D1 \& D2 ( 5890Å ) and CaII K ( 3933Å ) interstellar absorption line profiles recorded towards several post-AGB stars located within the M13 and M15 globular clusters , supplemented with a lower resolution spectrum of the CaII K-line observed in absorption towards an Ofpe/WN9 star in the central region of the M33 galaxy .
The normalized interstellar absorption profiles have been fit with cloud component velocities , doppler widths and column densities in order to investigate the kinematics and physical conditions of the neutral and partially ionized gas observed along each sight-line .
Our CaII observations towards M13 have revealed 4 absorption components that can be identified with galactic Intermediate Velocity Clouds ( IVCs ) spanning the -50 > V _ { lsr } > -80 km s ^ { -1 } range .
The NaI/CaII ratio for these IVC ’ s is < 0.3 , which characterizes the gas as being warm ( T \sim 10 ^ { 3 } K ) and partially ionized .
Similar observations towards two stars within M15 have revealed absorption due to a galactic IVC at V _ { lsr } \sim +65 km s ^ { -1 } .
This IVC is revealed to have considerable velocity structure , requiring at least 3 cloud components to fit the observed NaI and CaII profiles .

CaII K-line observations of a sight-line towards the center of the M33 galaxy have revealed at least 10 cloud components .
A cloud at V _ { lsr } \sim -130 km s ^ { -1 } is either an IVC associated with the M33 galaxy occurring at +45 km s ^ { -1 } with respect to the M33 local standard of rest , or it is a newly discovered HVC associated with our own Galaxy .
In addition , 4 clouds have been discovered in the -165 > V _ { lsr } > -205 km s ^ { -1 } range .
Three of these clouds are identified with the disk gas of M33 , whereas a component at -203 km s ^ { -1 } could be IVC gas in the surrounding halo of M33 .