multiple temperature sensors

i want read 30 temperature sensors , data-log readings.
this exclusively data-logging,

i have been playing around lm34 , accuracy , speed seem acceptable.

any suggestions on how best add 29 sensors ?

i able scan 30 in 1 minute or less.

analog sensors require analog input (which have limited number of) , require calibration. digital sensors easier use. if use ds18b20 digital sensors can daisy-chain multiple sensors on single 1-wire bus. don't know you'd thirty sensors on single bus, you'd them on few buses. how far apart sensors need be? 1-wire bus isn't designed operate on long distances.

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