The first month was offered to consumers for free, with a subscription required thereafter.

Alternate web link (subscription required) may not have been the most natural choice after all.

One theme that came up was what we should do about linking to sites which require subscription.

These longer lines often required public subscription to build and crossed over land not owned by the mine owners.

The initial software download and all new content are free, with a monthly subscription required to play beyond the first 24 hours.

Effects of crude oil on swimming behavior and survival in the rice rat (subscription required).

No real money is ever wagered, but there is a monthly subscription required.

Accessed 30 April 2007 (abstract; full article requires subscription; purchase).

Access to the full version requires paid subscription.

Mites and ticks associated with some small mammals in Mexico (subscription required).